从人类生物样本中分离和功能性表征细菌囊泡的综合方法
Swati Thangariyal1, Sakshi Bhat1, Ashmit Mittal1
1Department of Molecular and Cellular Medicine, Institute of Liver and Biliary Sciences, Delhi, India.
Methods (San Diego, Calif.)
|March 1, 2025
概括
研究人员开发了一种新方法,从人体样本中分离细菌囊泡 (BVs),识别参与免疫反应和潜在诊断应用的关键蛋白质.
科学领域:
- 微生物学 微生物学
- 免疫学 免疫学 免疫学
- 生物化学 生物化学
背景情况:
- 细菌囊泡 (BVs) 对于细菌的传播和病变产生至关重要,但将它们从人类样本中分离出来是具有挑战性的.
- 现有的方法往往难以区分BV与来自宿主的细胞外囊泡 (EV).
- 关于BVs的知识主要基于体外培养的细菌,限制了对它们在体内作用的理解.
研究的目的:
- 从人体血和便样本中分离和鉴定细菌囊泡 (BVs) 的可靠和可复制的协议.
- 识别和分析健康个体BVs的蛋白质含量.
- 研究BVs在免疫细胞相互作用中的功能作用.
主要方法:
- 用密度梯度超离心法将BVs从血和便中分离和丰富.
- 使用传输电子显微镜 (TEM) 和纳米粒子跟踪分析 (NTA) 进行了形态特征表征.
- 在分子和功能分析中使用了西斑,ELISA,质谱和qRT-PCR.
主要成果:
- TEM和NTA证实了BV的存在 (25-250nm);西部斑点区分了BV (OmpA标志物) 与宿主EV (Alix标志物).
- 蛋白质组分析确定了血BV中的439种蛋白质和便BV中的327种蛋白质,其中300种是常见的蛋白质.
- 功能性测试显示,BVs被PBMCs快速吸收,并上调了Toll-like受体2 (TLR-2) 表达.
结论:
- 建立了一种可靠的方法来从人类样本中丰富和识别细菌囊泡.
- 这项研究揭示了与健康个体BVs相关的关键蛋白质及其在免疫调节中的作用.
- 这些发现为探索各种疾病的诊断和治疗中BV提供了基础.
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